Other things equal, would the formation of a customs union with many members be more likely or less likely to improve welfare for a given member country than the formation of a customs union with only a few members? Why or why not? Other things equal, would the formation of a customs union be more likely or less likely to enhance welfare for a given member country if that country had very high pre-union tariffs than if it had very low pre-union tariffs? Why or why not?